Neha swims in a 90 m long pool. She covers 180 m in
one minute by swimming from one end to the other
and back along the same straight path. Find the
average speed and average velocity of Neha.

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve